Bug#898629: improve battery life on laptop with kernel config
Package: linux
Version: 4.17~rc3-1~exp1
Severity: wishlist
Tags: patch
Hi,
I've found Fedora28 tries to improve battery life on laptop.
https://docs.fedoraproject.org/f28/release-notes/sysadmin/Kernel.html#sect-kernel-battery
There are three points.
1. A new SATA link-powermanagement-policy has been written which mirrors
Windows defaults: med_power_with_dipm, this has been merged for kernel
4.15, as part of this change this new policy will be the default on all
Intel mobile chipsets. This saves aprox. 1.0 - 1.5 Watts of power on an
idle laptop.
2. Enable Intel HDA codec power-saving by default with a 1 second timeout.
This saves aprox. 0.4 Watts of power on an idle laptop.
3. Enable USB autosuspend for USB bluetooth receivers by default. If all
other USB devices on the laptop also have USB auto-suspend enabled
(which typically is true) this saves aprox. 0.4 Watts of power on an idle
laptop.
Can we introduce such improvement into debian kernel? (especially amd64)
I've tested it with modified 4.17~rc3 kernel as below and powertop, power
consumption becomes 5.76 w to 4.61 w on my ThinkPad E450.
--- ./linux-4.17~rc3/debian/config/config 2018-04-20 09:33:41.000000000 +0900
+++ /home/henrich/linux-4.17~rc3/debian/config/config 2018-05-06 10:54:04.478447041 +0900
@@ -199,6 +199,7 @@
CONFIG_SATA_ZPODD=y
CONFIG_SATA_PMP=y
CONFIG_SATA_AHCI=m
+CONFIG_SATA_MOBILE_LPM_POLICY=3
# CONFIG_SATA_AHCI_PLATFORM is not set
# CONFIG_AHCI_CEVA is not set
# CONFIG_AHCI_QORIQ is not set
@@ -360,6 +361,7 @@
## file: drivers/bluetooth/Kconfig
##
CONFIG_BT_HCIBTUSB=m
+CONFIG_BT_HCIBTUSB_AUTOSUSPEND=y
CONFIG_BT_HCIBTUSB_BCM=y
CONFIG_BT_HCIBTUSB_RTL=y
CONFIG_BT_HCIBTSDIO=m
@@ -7327,7 +7329,8 @@
CONFIG_SND_HDA_CODEC_CMEDIA=y
CONFIG_SND_HDA_CODEC_SI3054=y
CONFIG_SND_HDA_GENERIC=y
-CONFIG_SND_HDA_POWER_SAVE_DEFAULT=0
+CONFIG_SND_HDA_POWER_SAVE_DEFAULT=1
+CONFIG_SND_HDA_POWER_SAVE=y
##
## file: sound/pcmcia/Kconfig
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